Comma separator for OTP mode parameter should not be encoded.

[binh-dam-ibigroup]

Observed behavior

Busgnag errors are observed as follows:

Unable to get POJO from json for OtpResponse
com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'org': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: (String)"org.glassfish.jersey.server.ParamException$QueryParamException: HTTP 404 Not Found HTTP 404 Not Found"; line: 1, column: 4]

This is caused by the OTP request sent by the middleware where the MODE url parameter appears as
for instance WALK%2CBUS%2CSUBWAY%2CTRAM.

Expected behavior

The mode parameter above in the OTP request should appear as WALK,BUS,SUBWAY,TRAM.

Steps to reproduce the problem

Observed in these Bugsnag reports:

• https://app.bugsnag.com/ibi-group-1/atlrides-otp-middleware/errors/60b905bcf8f5f00007a4092e?filters[event.since][0]=30d&filters[error.status][0]=for_review

Any special notes on configuration used

ATL Rides

Version of otp-middleware and/or OpenTripPlanner if applicable (exact commit hash or branch name)

dev branch.